| original |
Namurian A |
|
Germany |
Horst,U. Phase-contrast photography, a new aid for microscopic coal research. |
1950 |
| details |
Namurian A |
|
Germany |
Potonie,R. et al. The spore dispersae of the Rhur Carboniferous, their morphography and stratigraphy with reviews of species of other areas.Part 2 |
1956 |
| details |
Namurian A |
Dogger |
W.Germany(Hesse) |
Schulz,E. Study of fossil spores from Rhaetian-Liassic Layers in the central part of the German Basin. |
1967 |
| details |
Namurian A |
|
Germany |
Schulz,E. Study of fossil spores from Rhaetian-Liassic Layers in the central part of the German Basin. |
1967 |